\pgfplotsset{
	every spark line/.style={
			hide axis,
			clip=false,
			bar width=2pt,
			cycle list={blue,mark=none\\},
			height=0.8\baselineskip,
			anchor=south west,
			width=5\baselineskip,
			scale only axis,
			filter point/.code={%
					\xdef\sparklinex{\pgfkeysvalueof{/data point/x}}%
					\global\let\sparklineENDy\sparkliney
				},
			extra description/.code={%
					\node[begin node description]  {\pgfkeysvalueof{/pgfplots/begin node text}};
					\node[end node description]    {\pgfkeysvalueof{/pgfplots/end node text}};
				},
		},
	spark std max/.initial=,
	spark std min/.initial=,
	/tikz/spark std region/.style={fill=gray!10},
	begin node text/.initial=\pgfmathprintnumber{\sparklineSTARTy},
	end node text/.initial=  \pgfmathprintnumber{\sparklineENDy},
	/tikz/begin node description/.style={
			text width=3em,align=right,
			base left,sparkcolor,
			/pgf/number format/fixed,
			/pgf/number format/fixed zerofill,
			/pgf/number format/showpos,
			at={(current axis.south west)},
		},
}
